JP2008292192A - Transformer tester - Google Patents

Transformer tester Download PDF

Info

Publication number
JP2008292192A
JP2008292192A JP2007135543A JP2007135543A JP2008292192A JP 2008292192 A JP2008292192 A JP 2008292192A JP 2007135543 A JP2007135543 A JP 2007135543A JP 2007135543 A JP2007135543 A JP 2007135543A JP 2008292192 A JP2008292192 A JP 2008292192A
Authority
JP
Japan
Prior art keywords
transformer
voltage
standard
secondary output
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2007135543A
Other languages
Japanese (ja)
Other versions
JP4767907B2 (en
Inventor
Takahiro Tsuchiyama
山 卓 宏 土
Jun Kawagoe
越 順 川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Electric Meters Inspection Corp JEMIC
Original Assignee
Japan Electric Meters Inspection Corp JEMIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Electric Meters Inspection Corp JEMIC filed Critical Japan Electric Meters Inspection Corp JEMIC
Priority to JP2007135543A priority Critical patent/JP4767907B2/en
Publication of JP2008292192A publication Critical patent/JP2008292192A/en
Application granted granted Critical
Publication of JP4767907B2 publication Critical patent/JP4767907B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Measuring Phase Differences (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer tester for accurately and rapidly measuring an electronic transformer. <P>SOLUTION: This transformer tester is used for comparing the secondary output of a tested transformer structured as an electronic transformer with the secondary output of a standard transformer to measure a relative error ε and a phase angle θ of the secondary output of the tested transformer, with respect to the secondary output of the standard transformer. This transformer tester is equipped with a conversion circuit CT-OP1 for converting the secondary output of the standard transformer into a standard voltage, having a value within a prescribed range, a difference detection circuit VT-OP2 for picking up the difference voltage between an output voltage of the tested transformer and the standard voltage, and a digital operation circuit AU for performing digital conversion with the standard voltage and the difference voltage given thereto, to calculate the phase angle of the difference voltage with respect to the standard voltage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、変成器試験装置に係わり、とくに変流器、変圧器の誤差を測定する装置に関する。   The present invention relates to a transformer testing apparatus, and more particularly to an apparatus for measuring an error of a current transformer and a transformer.

通常の変成器は、変圧器であれば、鉄心に１次巻線および２次巻線が巻装されており、１次巻線に１次電圧を印加すると電磁誘導により２次巻線に２次電圧が誘起される、というものである。変流器も同様に、１次巻線に電流を流すと、電磁誘導によって２次巻線に２次電流が流れる。   If a normal transformer is a transformer, a primary winding and a secondary winding are wound around an iron core. When a primary voltage is applied to the primary winding, 2 is applied to the secondary winding by electromagnetic induction. A secondary voltage is induced. Similarly, when a current flows through the primary winding, a secondary current flows through the secondary winding by electromagnetic induction.

そこで、従来の変成器試験装置は、標準および被試験の両変圧器の２次電圧同士、または変流器の２次電流同士を比較し、その比誤差および位相角を測定する構成となっている（特許文献１参照）。
特公昭５７−５７６６７号公報 Therefore, the conventional transformer testing apparatus is configured to compare the secondary voltages of both the standard and tested transformers or the secondary currents of the current transformers and measure the ratio error and phase angle. (See Patent Document 1).
Japanese Patent Publication No.57-57667

これに対して、近年、電子式変圧器（ＥＶＴ）または電子式変流器（ＥＣＴ）と呼ばれる被測定量を信号化して処理する変成器が登場し、これらの変成器は従来の変成器試験装置では測定することができないことがある。   On the other hand, in recent years, transformers called electronic transformers (EVT) or electronic current transformers (ECT) that convert and process measured quantities have appeared, and these transformers have been tested in conventional transformer tests. The instrument may not be able to measure.

最も端的な例を示せば、電子式変流器の場合、被試験量が電圧であるから標準量も電圧に変換する必要があり、電流出力のままでは比較測定ができない。   In the simplest example, in the case of an electronic current transformer, since the amount to be tested is a voltage, it is necessary to convert the standard amount to a voltage, and comparative measurement cannot be performed with the current output as it is.

また、従来は、標準変成器の２次出力信号と被試験変成器の２次出力信号とをアナログ的な帰還回路を用いて平衡を取っているが、この方法では、平衡を取るのに時間を要する。しかも、帰還回路を用いており、帰還量を増すと発振し易くなり動作が不安定である。 Conventionally, the secondary output signal of the standard transformer and the secondary output signal of the transformer under test are balanced using an analog feedback circuit, but this method requires time to balance. Cost. In addition, a feedback circuit is used, and when the feedback amount is increased, oscillation easily occurs and the operation becomes unstable.

とくに、位相角の誤差測定の原理式が近似式であり、高精度の測定には不向きである。   In particular, the principle formula of phase angle error measurement is an approximate expression and is not suitable for high-precision measurement.

本発明は上述の点を考慮してなされたもので、電子式変成器の位相角誤差を正確かつ迅速に測定することができる変成器試験装置を提供することを目的とする。   The present invention has been made in consideration of the above-described points, and an object of the present invention is to provide a transformer testing apparatus capable of accurately and quickly measuring a phase angle error of an electronic transformer.

上記目的達成のため、本発明では、
電子式変成器として構成された被試験変成器の２次出力を標準変成器の２次出力と比較し、前記被試験変成器の２次出力が前記標準変成器の２次出力に対する位相角誤差を測定する変成器試験装置であって、
前記標準変成器の２次出力を所定範囲の値を持った標準電圧に変換する変換回路と、
前記被試験変成器の出力電圧と前記標準電圧との偏差電圧を取り出す偏差検出回路と、
前記標準電圧と前記偏差電圧とが与えられてディジタル変換し、前記標準電圧に対する前記偏差電圧の比誤差と位相角を算出するディジタル演算回路と
をそなえたことを特徴とする変成器試験装置、
を提供するものである。 In order to achieve the above object, in the present invention,
The secondary output of the transformer under test configured as an electronic transformer is compared with the secondary output of the standard transformer, and the secondary output of the transformer under test is a phase angle error relative to the secondary output of the standard transformer. A transformer testing device for measuring
A conversion circuit for converting the secondary output of the standard transformer into a standard voltage having a value within a predetermined range;
A deviation detection circuit for extracting a deviation voltage between the output voltage of the transformer under test and the standard voltage;
A transformer test apparatus comprising: a digital arithmetic circuit that is provided with the standard voltage and the deviation voltage and performs digital conversion, and calculates a ratio error and a phase angle of the deviation voltage with respect to the standard voltage;
Is to provide.

本発明は上述のように、標準電圧を形成するとともに被試験電圧の標準電圧に対する偏差電圧を検出して両者を用いて演算することにより比誤差と位相角を算出するようにしたため、電子式変成器として構成された被試験変成器の２次出力における位相角誤差を正確かつ迅速に測定することができる。   In the present invention, as described above, since the standard voltage is formed and the deviation voltage of the voltage under test with respect to the standard voltage is detected and calculated using both, the ratio error and the phase angle are calculated. The phase angle error at the secondary output of the transformer under test configured as a transformer can be measured accurately and quickly.

以下、添付図面を参照して本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

実施形態１Embodiment 1

図１は、被試験変成器がＥＣＴである、本発明の一実施例の構成を示している。この場合、被試験変流器ＥＣＴｘから２次出力電流に対応した被試験電圧Ｖｘが与えられる。また、巻数比ｎ１１：ｎ１２の標準変流器ＣＴから取り出され、この標準変流器ＣＴの２次電圧が演算増幅器ＯＰ１に与えられて得られた出力である標準電圧ｖｓが、偏差検出用の変圧器ＶＴの１次巻線の一端、およびディジタル演算部ＡＵの１次巻線に設けられた２つの入力端子の一方に与えられる。 FIG. 1 shows the configuration of an embodiment of the present invention in which the transformer under test is an ECT. In this case, a voltage under test Vx corresponding to the secondary output current is given from the current transformer ECTx under test. The turns ratio n11: taken from the standard current transformer CT of n12, standard voltage v s 2 primary voltage is the output obtained is given to the operational amplifier OP1 of the standard current transformer CT is, for deviation detection Is applied to one end of the primary winding of the transformer VT and one of the two input terminals provided in the primary winding of the digital arithmetic unit AU.

一方、被試験電圧Ｖｘは、偏差検出用の変圧器ＶＴの２つの入力端子の他方に与えられる。これにより、偏差検出用の変圧器ＶＴの２次側出力端子には、演算増幅器ＯＰ２が接続され、偏差電圧Δｖが取り出されてディジタル演算部ＡＵに与えられる。   On the other hand, the voltage under test Vx is applied to the other of the two input terminals of the deviation detecting transformer VT. As a result, the operational amplifier OP2 is connected to the secondary output terminal of the transformer VT for detecting the deviation, and the deviation voltage Δv is taken out and applied to the digital operation unit AU.

ここで、上記標準電圧ｖｓおよび偏差電圧Δｖは、下式（ａ１），（ａ２）の通り表わすことができる。

Figure 2008292192
Here, the standard voltage v s and the deviation voltage Δv is the following formula (a1), can be expressed as (a2).
Figure 2008292192

ディジタル演算部ＡＵは、２つの入力つまり標準電圧としてのｖｓと偏差電圧としてのΔｖとから、詳細は図３を用いて後述するように、比誤差εおよび位相角θを算出する。 Digital processing unit AU from the Δv as v s and the deviation voltage as the two input words standard voltage, as will be described later in detail with reference to FIG. 3, calculates a ratio error ε and the phase angle theta.

実施形態２Embodiment 2

図２は、被試験変成器がＥＶＴである本発明の他の実施例の構成を示している。この場合、被試験電圧Ｖｘは実施例１と同様であるが、標準電圧ｖｓは、巻数比がｎ１１対ｎ１２である誘導分圧器ＩＶＤから与えられる。 FIG. 2 shows a configuration of another embodiment of the present invention in which the transformer under test is an EVT. In this case, although the test voltage Vx are the same as in Example 1, the standard voltage v s is given from the inductive divider IVD turns ratio is n11 vs. n12.

ここで、上記標準電圧ｖｓおよび偏差電圧Δｖは、下式（ｂ１），（ｂ２）の通り表わすことができる。

Figure 2008292192
Here, the standard voltage v s and the deviation voltage Δv is the following formula (b1), it can be expressed as (b2).
Figure 2008292192

ディジタル演算部Digital operation unit

図３は、実施例１，２に示したディジタル演算部ＡＵにより具体的な回路構成を示すブロック線図である。この演算部ＡＵは、標準電圧ｖｓ、偏差電圧Δｖをディジタル変換するＡ／Ｄ変換器ＡＤＣ１，ＡＤＣ２の出力電圧ｖｓ（ｔ），Δｖ（ｔ）を得て、３つの乗算回路ＭＰ１ないしＭＰ３および移相メモリーＭにより下記信号Ａ，Ｂ，Ｃを形成し、更にこれら信号Ａ，Ｂ，Ｃを中央処理装置ＣＰＵに与えて下式（１），（２）により比誤差εおよび位相角θを算出させる。

Figure 2008292192
ここで、
Figure 2008292192
 である。 FIG. 3 is a block diagram showing a specific circuit configuration by the digital operation unit AU shown in the first and second embodiments. The arithmetic unit AU obtains output voltages v s (t) and Δv (t) of the A / D converters ADC1 and ADC2 for digitally converting the standard voltage v s and the deviation voltage Δv, and three multiplication circuits MP1 to MP3. The following signals A, B, and C are formed by the phase shift memory M, and these signals A, B, and C are given to the central processing unit CPU, and the ratio error ε and the phase angle θ are expressed by the following equations (1) and (2). Is calculated.
Figure 2008292192
 here,
Figure 2008292192
 It is.

これらの数式３および数式４に示すように、比誤差εおよび位相角θの算出は、ディジタル方式での信号Ａ，ＢおよびＣに基く演算によりなされており、アナログ回路における問題、すなわち帰還回路を用いた構成に起因する発振等の問題を生じない。したがって、常に安定的に測定を行うことができる。   As shown in these mathematical formulas 3 and 4, the calculation of the ratio error ε and the phase angle θ is performed by calculation based on the signals A, B, and C in the digital system, and the problem in the analog circuit, that is, the feedback circuit is determined. Problems such as oscillation due to the configuration used do not occur. Therefore, the measurement can always be performed stably.

しかも、算出式は、従来の位相角θの算出に用いていた近似方式によるものではないから位相角θの測定精度を向上することができる。   Moreover, since the calculation formula is not based on the approximation method used for calculating the conventional phase angle θ, the measurement accuracy of the phase angle θ can be improved.

本発明を変流器に適用した第１の実施形態の構成を示す説明図。Explanatory drawing which shows the structure of 1st Embodiment which applied this invention to the current transformer. 本発明を変圧器に適用した第２の実施形態の構成を示す説明図。Explanatory drawing which shows the structure of 2nd Embodiment which applied this invention to the transformer. 第１および第２の実施形態に用いるディジタル演算部の詳細構成を示すブロック線図。The block diagram which shows the detailed structure of the digital calculating part used for 1st and 2nd embodiment.

符号の説明Explanation of symbols

ＣＴ 変流器、ＶＴ 変圧器、ＯＰ 演算増幅器、ＡＵ ディジタル演算部、
ＩＶＤ 誘導分圧器、ＡＤＣ Ａ／Ｄ変換器、Ｍ メモリー、
ＭＰ 乗算回路、ＣＰＵ 中央演算処理装置。
Ｖｓ，ｖｓ 標準電圧、Ｖｘ 被試験電圧、Δｖ 偏差電圧。
ε 比誤差、θ 位相角。 CT current transformer, VT transformer, OP operational amplifier, AU digital arithmetic unit,
IVD induction voltage divider, ADC A / D converter, M memory,
MP multiplier circuit, CPU central processing unit.
Vs, v s standard voltage, Vx under test voltage, Δv deviation voltage.
ε Ratio error, θ phase angle.

Claims (5)

電子式変成器として構成された被試験変成器の２次出力を標準変成器の２次出力と比較し、前記被試験変成器の２次出力が前記標準変成器の２次出力に対する位相角誤差を測定する変成器試験装置であって、
前記標準変成器の２次出力を所定範囲の値を持った標準電圧に変換する変換回路と、
前記被試験変成器の出力電圧と前記標準電圧との偏差電圧を取り出す偏差検出回路と、
前記標準電圧と前記偏差電圧とが与えられてディジタル変換し、前記標準電圧に対する前記偏差電圧の比誤差と位相角を算出するディジタル演算回路と
をそなえたことを特徴とする変成器試験装置。 The secondary output of the transformer under test configured as an electronic transformer is compared with the secondary output of the standard transformer, and the secondary output of the transformer under test is a phase angle error relative to the secondary output of the standard transformer. A transformer testing device for measuring
A conversion circuit for converting the secondary output of the standard transformer into a standard voltage having a value within a predetermined range;
A deviation detection circuit for extracting a deviation voltage between the output voltage of the transformer under test and the standard voltage;
A transformer testing apparatus, comprising: a digital arithmetic circuit which receives the standard voltage and the deviation voltage and performs digital conversion and calculates a ratio error and a phase angle of the deviation voltage with respect to the standard voltage. 請求項１記載の変成器試験装置において、
前記変換回路は、変流器と演算増幅器とにより構成されたことを特徴とする変成器試験装置。 The transformer test device of claim 1,
The transformer circuit comprises a current transformer and an operational amplifier. 請求項１記載の変成器試験装置において、
前記変換回路は、変圧器として構成されたことを特徴とする変成器試験装置。 The transformer test device of claim 1,
The transformer testing device, wherein the conversion circuit is configured as a transformer. 請求項１記載の変成器試験装置において、
前記偏差検出回路は、1次巻線に前記標準電圧および前記被試験変成器の出力電圧が与えられ、２次巻線に前記標準電圧と前記被試験変成器の出力電圧との偏差電圧を取り出すようにしたことを特徴とする変成器試験装置。 The transformer test device of claim 1,
The deviation detection circuit receives the standard voltage and the output voltage of the transformer under test in a primary winding, and takes out a deviation voltage between the standard voltage and the output voltage of the transformer under test in a secondary winding. A transformer testing device characterized by that. 請求項１記載の変成器試験装置において、
前記ディジタル演算回路は、下記式（１）および（２）に示す演算を行う回路およびメモリーＭを有することを特徴とする変成器試験装置。
Figure 2008292192
 ただし、
Figure 2008292192
 The transformer test device of claim 1,
The digital arithmetic circuit has a circuit for performing arithmetic operations shown in the following formulas (1) and (2) and a memory M, and is a transformer testing device.
Figure 2008292192
 However,
Figure 2008292192
JP2007135543A 2007-05-22 2007-05-22 Transformer test equipment Active JP4767907B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007135543A JP4767907B2 (en) 2007-05-22 2007-05-22 Transformer test equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007135543A JP4767907B2 (en) 2007-05-22 2007-05-22 Transformer test equipment

Publications (2)

Publication Number Publication Date
JP2008292192A true JP2008292192A (en) 2008-12-04
JP4767907B2 JP4767907B2 (en) 2011-09-07

Family

ID=40167082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007135543A Active JP4767907B2 (en) 2007-05-22 2007-05-22 Transformer test equipment

Country Status (1)

Country Link
JP (1) JP4767907B2 (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101968536A (en) * 2010-09-01 2011-02-09 江西省电力科学研究院 Induction voltage divider based method for judging detection error exception of voltage transformer
CN102043139A (en) * 2010-12-16 2011-05-04 中国人民解放军空军工程大学 Calibration device of current transformer and method for calibrating current transformer by using same
CN102053235A (en) * 2010-10-21 2011-05-11 中国南方电网有限责任公司超高压输电公司柳州局 On-site steady-state accuracy verification system for electronic current transformer and verification method thereof
CN102236085A (en) * 2010-12-22 2011-11-09 保定天威集团有限公司 Method for measuring error of current transformer under 200Hz frequency
CN102495390A (en) * 2011-12-02 2012-06-13 河南省电力公司南阳供电公司 Field calibrator for electronic transformer
CN103336263A (en) * 2013-05-30 2013-10-02 广东电网公司电力科学研究院 500kV voltage transformer power frequency voltage proportion standard detection method
CN103344895A (en) * 2013-07-30 2013-10-09 河北海纳电测仪器股份有限公司 Automatic verification system of low-voltage current transformer
CN103376437A (en) * 2012-04-28 2013-10-30 南京河海南自水电自动化有限公司 Transformer calibrator compatible with both electromagnetic transformer calibration and electronic transformer calibration
CN103513082A (en) * 2013-09-10 2014-01-15 中国电力科学研究院 Electronic type mutual inductor with error on-line monitoring function
CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN104569897A (en) * 2014-12-11 2015-04-29 许继集团有限公司 Standard Rogowski coil-based electronic current transformer calibration system
CN105823952A (en) * 2016-05-09 2016-08-03 东莞市博展机械科技有限公司 Transformer test machine
CN106772189A (en) * 2016-11-18 2017-05-31 云南电网有限责任公司电力科学研究院 A kind of DC voltage transformer synchronous calibration method and system
WO2017146311A1 (en) * 2016-02-23 2017-08-31 한국표준과학연구원 Evaluation device of voltage transformer comparator
CN109856583A (en) * 2017-11-30 2019-06-07 中国电力科学研究院有限公司 A kind of measuring device and method of electronic current mutual inductor progress of disease delay
CN112068062A (en) * 2020-09-10 2020-12-11 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Mutual inductor calibration system and calibration method
KR102218376B1 (en) * 2019-10-04 2021-02-22 한국전력공사 Apparatus and method for testing the properties of optical transformer
CN116736212A (en) * 2023-06-20 2023-09-12 威胜集团有限公司 On-line monitoring and metering method for running errors of mutual inductor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103543428B (en) * 2012-07-13 2017-01-25 天门市电工仪器仪表研究所 Miniature current transformer ratio error self-calibration system
CN104614566A (en) * 2015-01-28 2015-05-13 中国计量科学研究院 Voltage proportioner and self-checking device and method of phase angle error
CN105487034A (en) * 2016-01-25 2016-04-13 云南电网有限责任公司电力科学研究院 0.05-level electronic transformer verification method and system
CN106842097A (en) * 2017-02-21 2017-06-13 国网江西省电力公司电力科学研究院 A kind of anti-DC performance detection means of current transformer and method
CN107978440B (en) * 2017-11-15 2019-07-12 国网重庆市电力公司电力科学研究院 A kind of mutual inductor interstar connection box
CN109284933B (en) * 2018-10-09 2021-11-30 国网江苏省电力有限公司电力科学研究院 Electronic transformer state evaluation system and method based on mathematical statistics

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004233083A (en) * 2003-01-28 2004-08-19 Nippon Denki Keiki Kenteisho Transformer testing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004233083A (en) * 2003-01-28 2004-08-19 Nippon Denki Keiki Kenteisho Transformer testing device

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101968536A (en) * 2010-09-01 2011-02-09 江西省电力科学研究院 Induction voltage divider based method for judging detection error exception of voltage transformer
CN102053235A (en) * 2010-10-21 2011-05-11 中国南方电网有限责任公司超高压输电公司柳州局 On-site steady-state accuracy verification system for electronic current transformer and verification method thereof
CN102043139A (en) * 2010-12-16 2011-05-04 中国人民解放军空军工程大学 Calibration device of current transformer and method for calibrating current transformer by using same
CN102236085A (en) * 2010-12-22 2011-11-09 保定天威集团有限公司 Method for measuring error of current transformer under 200Hz frequency
CN102495390A (en) * 2011-12-02 2012-06-13 河南省电力公司南阳供电公司 Field calibrator for electronic transformer
CN103376437A (en) * 2012-04-28 2013-10-30 南京河海南自水电自动化有限公司 Transformer calibrator compatible with both electromagnetic transformer calibration and electronic transformer calibration
CN103336263A (en) * 2013-05-30 2013-10-02 广东电网公司电力科学研究院 500kV voltage transformer power frequency voltage proportion standard detection method
CN103344895A (en) * 2013-07-30 2013-10-09 河北海纳电测仪器股份有限公司 Automatic verification system of low-voltage current transformer
CN103513082A (en) * 2013-09-10 2014-01-15 中国电力科学研究院 Electronic type mutual inductor with error on-line monitoring function
CN104316891A (en) * 2014-09-29 2015-01-28 许继电气股份有限公司 Electronic mutual inductor performance real-time monitoring system and method
CN104569897A (en) * 2014-12-11 2015-04-29 许继集团有限公司 Standard Rogowski coil-based electronic current transformer calibration system
WO2017146311A1 (en) * 2016-02-23 2017-08-31 한국표준과학연구원 Evaluation device of voltage transformer comparator
KR101851968B1 (en) * 2016-02-23 2018-04-26 한국표준과학연구원 Evaluation apparatus of voltage transformer test set
CN105823952A (en) * 2016-05-09 2016-08-03 东莞市博展机械科技有限公司 Transformer test machine
CN106772189A (en) * 2016-11-18 2017-05-31 云南电网有限责任公司电力科学研究院 A kind of DC voltage transformer synchronous calibration method and system
CN106772189B (en) * 2016-11-18 2023-11-21 云南电网有限责任公司电力科学研究院 Synchronous calibration method and system for direct-current voltage transformer
CN109856583A (en) * 2017-11-30 2019-06-07 中国电力科学研究院有限公司 A kind of measuring device and method of electronic current mutual inductor progress of disease delay
CN109856583B (en) * 2017-11-30 2020-10-27 中国电力科学研究院有限公司 Measuring device and method for transmission delay of electronic current transformer
KR102218376B1 (en) * 2019-10-04 2021-02-22 한국전력공사 Apparatus and method for testing the properties of optical transformer
CN112068062A (en) * 2020-09-10 2020-12-11 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Mutual inductor calibration system and calibration method
CN116736212A (en) * 2023-06-20 2023-09-12 威胜集团有限公司 On-line monitoring and metering method for running errors of mutual inductor
CN116736212B (en) * 2023-06-20 2024-02-06 威胜集团有限公司 On-line monitoring and metering method for running errors of mutual inductor

Also Published As

Publication number Publication date
JP4767907B2 (en) 2011-09-07

Similar Documents

Publication Publication Date Title
JP4767907B2 (en) Transformer test equipment
US9829512B2 (en) Methods and systems relating to AC current measurements
US10209280B2 (en) Circuit breaker
US20130241529A1 (en) Calibration of non-contact current sensors
Mohns et al. An AC current transformer standard measuring system for power frequencies
RU2727565C1 (en) Current measurement method and current measurement device
US11519993B2 (en) Current sensor configuration and calibration
JP6296452B2 (en) Iron loss measuring method and iron loss measuring apparatus
US11112434B2 (en) Sensor apparatus for measuring direct and alternating currents
EP2397864A1 (en) Electricity meter and method for determining a quantity
JP4993728B2 (en) Effective leakage current measuring instrument
WO2017140616A1 (en) A method and a system for measuring power loss in a power transformer
JP2007003407A (en) Method and apparatus for measuring impedance
KR100805902B1 (en) A ratio error evaluation device of a current transformer ratio error comparator
Draxler et al. Calibration of AC clamp meters
JP2020204524A (en) Current sensor and measuring device
JP6494540B2 (en) Electromagnetic field measurement system and electromagnetic field measurement method
JP2004245584A (en) Two-terminal circuit element measuring equipment and contact checking method
JP2006170666A (en) Dielectric loss tangent measuring device
KR101606232B1 (en) Electronic watt-hour meter
EP1642142B1 (en) Method and circuit arrangement for the self-testing of a reference voltage in electronic components
JP5877262B1 (en) Calibrator for electromagnetic flowmeter
JP2008298459A (en) Device for measuring impedance
CN220795349U (en) Current detection circuit and current detection device
JPH07234102A (en) Displacement measuring apparatus

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100218

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100223

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100426

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100517

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110225

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110426

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110517

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110615

R150 Certificate of patent or registration of utility model

Ref document number: 4767907

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140624

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250